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Date: Sun, 10 May 2015 13:26:34 +0300
From: Haggai Eran <haggaie@...lanox.com>
To: Doug Ledford <dledford@...hat.com>
Cc: linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
Liran Liss <liranl@...lanox.com>,
Guy Shapiro <guysh@...lanox.com>,
Shachar Raindel <raindel@...lanox.com>,
Yotam Kenneth <yotamke@...lanox.com>,
Haggai Eran <haggaie@...lanox.com>
Subject: [PATCH v3 for-next 03/13] IB/core: Find the network namespace matching connection parameters
From: Yotam Kenneth <yotamke@...lanox.com>
In the case of IPoIB, and maybe in other cases, the network device is
managed by an upper-layer protocol (ULP). In order to expose this
network device to other users of the IB device, let ULPs implement
a callback that returns network device according to connection parameters.
The IB device and port, together with the P_Key and the IP address should
be enough to uniquely identify the ULP net device.
This function is passed to ib_core as part of the ib_client
registration.
Using this functionality, add a way to get the network namespace
corresponding to a work completion. This is needed so that responses to CM
requests can be sent from the same network namespace as the request.
Signed-off-by: Haggai Eran <haggaie@...lanox.com>
Signed-off-by: Yotam Kenneth <yotamke@...lanox.com>
Signed-off-by: Shachar Raindel <raindel@...lanox.com>
Signed-off-by: Guy Shapiro <guysh@...lanox.com>
---
drivers/infiniband/core/device.c | 53 ++++++++++++++++++++++++++++++++++++++++
include/rdma/ib_verbs.h | 33 +++++++++++++++++++++++++
2 files changed, 86 insertions(+)
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 7d90b2ca2eba..3b9e80ce0b42 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -38,6 +38,7 @@
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/mutex.h>
+#include <linux/netdevice.h>
#include <rdma/rdma_netlink.h>
#include "core_priv.h"
@@ -760,6 +761,58 @@ int ib_find_pkey(struct ib_device *device,
}
EXPORT_SYMBOL(ib_find_pkey);
+static struct net_device *ib_get_net_dev_by_port_pkey_ip(struct ib_device *dev,
+ u8 port,
+ u16 pkey,
+ struct sockaddr *addr)
+{
+ struct net_device *ret = NULL;
+ struct ib_client *client;
+ int id;
+
+ id = srcu_read_lock(&device_srcu);
+
+ list_for_each_entry_rcu(client, &client_list, list)
+ if (client->get_net_device_by_port_pkey_ip) {
+ ret = client->get_net_device_by_port_pkey_ip(dev, port,
+ pkey,
+ addr);
+ if (ret)
+ break;
+ }
+
+ srcu_read_unlock(&device_srcu, id);
+
+ return ret;
+}
+
+struct net *ib_get_net_ns_by_port_pkey_ip(struct ib_device *dev,
+ u8 port,
+ u16 pkey,
+ struct sockaddr *addr)
+{
+ struct net_device *ndev = NULL;
+ struct net *ns;
+
+ if (rdma_protocol_ib(dev, port))
+ ndev = ib_get_net_dev_by_port_pkey_ip(dev, port, pkey, addr);
+
+ if (!ndev)
+ goto not_found;
+
+ rcu_read_lock();
+ ns = maybe_get_net(dev_net(ndev));
+ dev_put(ndev);
+ rcu_read_unlock();
+ if (!ns)
+ goto not_found;
+ return ns;
+
+not_found:
+ return get_net(&init_net);
+}
+EXPORT_SYMBOL(ib_get_net_ns_by_port_pkey_ip);
+
static int __init ib_core_init(void)
{
int ret;
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index c7241149f142..7baf3c40ef97 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -48,6 +48,7 @@
#include <linux/rwsem.h>
#include <linux/scatterlist.h>
#include <linux/workqueue.h>
+#include <linux/socket.h>
#include <uapi/linux/if_ether.h>
#include <linux/atomic.h>
@@ -1691,6 +1692,24 @@ struct ib_client {
void (*add) (struct ib_device *);
void (*remove)(struct ib_device *);
+ /* Returns the net_dev belonging to this ib_client and matching the
+ * given parameters.
+ * @dev: An RDMA device that the net_dev use for communication.
+ * @port: A physical port number on the RDMA device.
+ * @pkey: P_Key that the net_dev uses if applicable.
+ * @addr: An IP address the net_dev is configured with.
+ *
+ * An ib_client that implements a net_dev on top of RDMA devices
+ * (such as IP over IB) should implement this callback, allowing the
+ * rdma_cm module to find the right net_dev for a given request.
+ *
+ * The caller is responsible for calling dev_put on the returned
+ * netdev. */
+ struct net_device *(*get_net_device_by_port_pkey_ip)(
+ struct ib_device *dev,
+ u8 port,
+ u16 pkey,
+ struct sockaddr *addr);
struct list_head list;
};
@@ -2834,4 +2853,18 @@ static inline int ib_check_mr_access(int flags)
int ib_check_mr_status(struct ib_mr *mr, u32 check_mask,
struct ib_mr_status *mr_status);
+/**
+ * ib_get_net_ns_by_port_pkey_ip() - Return the appropriate net namespace
+ * for a received CM request
+ * @dev: An RDMA device on which the request has been received.
+ * @port: Port number on the RDMA device.
+ * @pkey: The Pkey the request came on.
+ * @addr: Contains the IP address that the request specified as its
+ * destination.
+ */
+struct net *ib_get_net_ns_by_port_pkey_ip(struct ib_device *dev,
+ u8 port,
+ u16 pkey,
+ struct sockaddr *addr);
+
#endif /* IB_VERBS_H */
--
1.7.11.2
--
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